Physics Questions Practice Question and Answer
8 Q: A 40kVA transformer has core loss of 400 W & full load copper loss of 800 W. The proportion of full load at maximum efficiency is -
727 06304af8620c0656a1d925419
6304af8620c0656a1d925419- 150%false
- 262.3%false
- 370.7%true
- 4100%false
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Answer : 3. "70.7%"
Q: Consider copper and aluminum wire whose length and resistance are the same. Also, the specific resistance of aluminum is more than copper. Select the correct statement
726 063c8d853b338bc336f0c3de7
63c8d853b338bc336f0c3de7- 1Copper and aluminum mass are the samefalse
- 2Copper wire has more mass than the aluminum wirefalse
- 3Copper wire has less mass than the aluminum wirefalse
- 4The information given is incompletetrue
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Answer : 4. "The information given is incomplete "
Q: Which of the following is the best conductor of heat?
718 0616559a93d260361529affd0
616559a93d260361529affd0- 1Leatherfalse
- 2Benzenefalse
- 3Mercurytrue
- 4Waterfalse
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Answer : 3. "Mercury "
Q: The capacity of parallel plate condenser is dependent on the
670 063c8e9831c47ef334be0ee88
63c8e9831c47ef334be0ee88- 1The separation between the platesfalse
- 2The metal used for the constructiontrue
- 3The thickness of the platefalse
- 4The potential applied across the platesfalse
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Answer : 2. "The metal used for the construction"
Explanation :
Therefore, the capacity of a parallel plate capacitor directly depends on the relative permittivity of dielectric material, the permittivity of space, the area of plates, and is inversely dependent on the separation between the plates.
Q: Which of the following elements has the largest atomic radii?
670 06419aed45bff3d098df69c79
6419aed45bff3d098df69c79- 1Berylliumfalse
- 2Lithiumtrue
- 3Nitrogenfalse
- 4Carbonfalse
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Answer : 2. "Lithium"
Explanation :
Francium (Fr) has the highest atomic radius in the periodic table. It belongs to the alkali metals group. Its atomic number is 87. The periodic trend of atomic radius suggests that the atomic radius usually decreases along a period (left to right) and increases down a group (top to bottom).
Q: Which of the following elements has the lowest melting point?
646 062de6dd1313eb40eb89fc72f
62de6dd1313eb40eb89fc72f- 1Chromiumfalse
- 2Hydrogentrue
- 3Zincfalse
- 4Silverfalse
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Answer : 2. "Hydrogen"
Q: The amount of work done in moving a charge of 4C across two points having a potential difference of 6V is ______.
633 0641974a1b34a0b67fcf4a8bf
641974a1b34a0b67fcf4a8bf- 148 Jfalse
- 212 Jfalse
- 336 Jfalse
- 424 Jtrue
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Answer : 4. "24 J"
Q: What is the constant of proportionality of an oscillator if the damping force is directly proportional to the velocity
600 063c8e053bdbddb32fda05b2a
63c8e053bdbddb32fda05b2a- 1Kg.s-1true
- 2Kg.m.s-1false
- 3Kg.sfalse
- 4Kg.m.s-2false
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Answer : 1. "Kg.s-1"
Explanation :
The damping force of an oscillating particle is observed to be proportional to velocity. The constant of proportionality can be measured in. kgs−1.